I really, really fail to understand the sudden love of PINs (which are a misnomer, since you can choose to include alpha & symbol characters) over strong passwords.
With the installation of the update to bump Version 1803 to Build 17134.81 when you go to log in it tries to get you to create a PIN, but if you decline after hitting the NEXT button (there is no option to decline on the first screen) it takes you right back to the first screen and makes you go through the process, including declining again.
This has happened to me on two separate machines today, and on both there were "Microsoft Account" windows (2), both minimized in the task bar that cannot be dismissed.
I'll stick with my strong passwords (and even the only kinda strong ones) that have not ever been hacked, and I've been using some of them for 30 years now [no, I do not change all of my passwords on a regular basis, and never will - I'll take the risk, which seems to me to be quite small if you actually keep 'em hard to guess and reasonably long].
And, now, even after going through the above, and shutting down, it's BACK AGAIN!!
Have left a strongly worded message on the Feedback Hub under an existing topic entitled, Stop asking me to set up a pin!